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How to Fill a Transfer Case on a 1985 Chevrolet Suburban

The fluid inside the transfer case on the 1985 Chevrolet Suburban keeps the internal parts cool and lubricated. The fluid circulates through the transfer case and keeps the moving parts inside of the transfer case from burning up. Once the transfer case fluid starts to break down, the fluid must be replaced because it can no longer protect the internal parts as it should.

Tools Used: Fluid catch pan, 1/2 inch drive ratchet, 3/4 inch socket, Long plastic tube, Fluid pump, New Dexron-2 transmission fluid

Fill Transfer Case

Park the 1985 Chevrolet Suburban on a level surface and turn the engine off.

Crawl under the driver side of the Suburban behind the driver side door. Locate the transfer case. The transfer case is attached to the drive shaft at both ends.

Locate the fill plug on the back side of the transfer case. The fill plug is located about half way up on the back side of the transfer case, near the rear yolk. (The fill plug is higher than the drain plug on the transfer case.)

Slide the catch pan underneath the fill plug on the transfer case. Loosen and remove the fill plug with the 1/2 inch drive ratchet and the 3/4 inch socket. Finish unscrewing the fill plug with your fingers. Remove the fill plug from the fill hole. Stick your finger inside of the hole. If you can feel fluid, the transfer case is full. If not, the transfer case is low on fluid.

Insert the long plastic tube into the fill hole on the transfer case. Attach the other end of the tube to the fluid pump. Start pumping the fluid into the transfer case until the fluid comes out of the fill hole. When fluid comes out of the fill hole, the transfer case is full.

Remove the long plastic tube from the fill hole and screw the fill plug back into the hole.

Tighten the fill plug down tight with the 1/2 inch drive ratchet and the 3/4 inch socket. Slide the fluid catch pan out from under the 1985 Chevrolet Suburban.

Tips & Warnings

Wear safety glasses when working around transmission fluid.

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